FAIR VALUE OF ASSETS AND LIABILITIES - Fair Value of Financial Instruments (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Assets
Accrued investment income	$ 69	$ 61
Reinsurance recoverables	378	8,108
Fair Value
Assets
Commercial mortgage and other loans		1,516
Policy loans		12
Short-term investments		81
Accrued investment income	69	61
Reinsurance recoverables		9
Receivables from parent and affiliates		5
Other assets		2,279
Total assets		4,240
Liabilities:
Cash collateral for loaned securities	186
Policyholders’ account balances - investment contracts		2,391
Payables to parent and affiliates		36
Other liabilities		105
Separate account liabilities - investment contracts		0
Total liabilities		2,532
Cash and cash equivalents		277
Fair Value | Level 1
Assets
Commercial mortgage and other loans		0
Policy loans		0
Short-term investments		81
Accrued investment income	0	0
Reinsurance recoverables		0
Receivables from parent and affiliates		0
Other assets		0
Total assets		358
Liabilities:
Cash collateral for loaned securities	0
Policyholders’ account balances - investment contracts		0
Payables to parent and affiliates		0
Other liabilities		0
Separate account liabilities - investment contracts		0
Total liabilities		0
Cash and cash equivalents		277
Fair Value | Level 2
Assets
Commercial mortgage and other loans		0
Policy loans		0
Short-term investments		0
Accrued investment income	69	61
Reinsurance recoverables		0
Receivables from parent and affiliates		5
Other assets		4
Total assets		70
Liabilities:
Cash collateral for loaned securities	186
Policyholders’ account balances - investment contracts		0
Payables to parent and affiliates		36
Other liabilities		105
Separate account liabilities - investment contracts		0
Total liabilities		141
Cash and cash equivalents		0
Fair Value | Level 3
Assets
Commercial mortgage and other loans		1,516
Policy loans		12
Short-term investments		0
Accrued investment income	0	0
Reinsurance recoverables		9
Receivables from parent and affiliates		0
Other assets		2,275
Total assets		3,812
Liabilities:
Cash collateral for loaned securities	0
Policyholders’ account balances - investment contracts		2,391
Payables to parent and affiliates		0
Other liabilities		0
Separate account liabilities - investment contracts		0
Total liabilities		2,391
Cash and cash equivalents		0
Carrying Amount
Assets
Commercial mortgage and other loans		1,504
Policy loans		12
Short-term investments		81
Accrued investment income	69	61
Reinsurance recoverables		8
Receivables from parent and affiliates		5
Other assets		2,279
Total assets		4,227
Liabilities:
Cash collateral for loaned securities	$ 186
Policyholders’ account balances - investment contracts		2,381
Payables to parent and affiliates		36
Other liabilities		105
Separate account liabilities - investment contracts		0
Total liabilities		2,522
Cash and cash equivalents		$ 277